Table 1. Descriptive statistic of the exposure variables shortest distance to roads ≥95th percentile of traffic, DWTD and LUR-PM10 between cases of LBW and controls.
| n | Minimum | Mean (SD) | Median | 25thPercentile | 75th Percentile | Máximum | ||
| DWTD (vehicles/hour) | All | 11,586 | 0.007 | 599.7 (±1,010.8) | 188.7 | 22.5 | 763.6 | 10,331.1 |
| Controls | 5,814 | 0,012 | 615.3 (±1,003.1) | 209.6 | 25.1 | 800.4 | 10,331.1 | |
| Cases | 5,772 | 0.012 | 583.9 (±1,018.3) | 168.8 | 20.8 | 730.0 | 10,331.1 | |
| Distances (meters) § * | All | 11,586 | 0 | 956.2 (±1,323.2) | 547.0 | 249.4 | 1,126.4 | 22,263.7 |
| Controls | 5,814 | 0 | 919.7 (±1,246.3) | 521.7 | 241.4 | 1,090.5 | 17063.9 | |
| Cases | 5,772 | 0.11 | 993.0 (±1,395.5) | 564.9 | 258.1 | 1,159.3 | 22,263.7 | |
| LUR-PM10 (µg/m3)** | All | 11,586 | 35.3 | 39.1 (±6.0) | 37,0 | 35.3 | 40.4 | 108.2 |
| Controls | 5,814 | 35,3 | 39.2 (±5.9) | 37.1 | 35.3 | 40.7 | 108.2 | |
| Cases | 5,772 | 35.1 | 39.0 (±6.1) | 36.8 | 35.3 | 40.1 | 108.2 |
§
Shortest distance to roads ≥95th percentile of traffic.
Statistical significance of the difference between cases and controls (*p = 0.003, **p = 0.041).